Yamaha BB-65 vs Yamaha BB-BOBO-SOLO-GP
The Yamaha BB-BOBO-SOLO-GP has a wider cup diameter, the Yamaha BB-65 features a deeper cup, the Yamaha BB-65 has a larger throat opening.
The internal diameter of the cup, measured at the widest point inside the rim.
Mouthpiece A
Yamaha BB-65
• Tuba
Cup diameter30.95 mm / 1.2185 in
Best suited for
High-volume projection — open throat for power
vs
Mouthpiece B
Yamaha BB-BOBO-SOLO-GP
• Tuba
Cup diameter32.20 mm / 1.2677 in
Best suited for
High-volume projection — open throat for power
Cup Diameter
The Yamaha BB-BOBO-SOLO-GP has a cup diameter of 32.20 mm / 1.2677 in compared to 30.95 mm / 1.2185 in on the Yamaha BB-65 — a difference of 1.25 mm / 0.0492 in. A wider cup generally produces a fuller, darker tone but requires more air support.
Which is better?
Neither mouthpiece clearly dominates the other — the right choice depends on your embouchure, playing style, and the sound you're after. Try both if possible.